Rotary pump



P. O. OTT

ROTARY PUMP July 3,1934.

` 7 2 Sheets-sheet 1 Filed Jan. 9. 1952 kw W 7% A `Jmsentol:

@m7 om o# 2 Sileets-Sheet 2 Snventor i Cttorneg 3 P. O. OTT

ROTARY PUMP .Filed Jan. 9. 1932 \.v b l @u ma July 3, 1934.

Patented July 3, 1934 PATENT OFFICE 1,965,388 ROTARY PUMP Percy Oliver Ott, Racine, Wis., assignor to Racine Tool & Machine Company, Racine, Wis., a corporation of Wisconsin Application January 9, 1932, Serial No. 585,659 2 (CLN3-136) The invention relates to hydraulic pumps and more particularlylto that type of rotary hydraulic pump wherein a rotor revolves around a stationary valve shaft provided with inlet and outlet ports that communicate during the cycle of operations with passages in the rotor which communicate with a plurality of pumping compartments formed between the body of the rotor,y

vanes in the rotor anda casing.

Among the objects of the invention are to provide a pump of the character above described in which the capacity of the pump may be readily varied, to improve the rotor assembly and its association with the valve shaft and to insure at all times an eicient action of the vanes without the use of springs. f

`The invention further consists in the several features hereinafter set forth and more particuylarly dened by claims at the conclusion hereof.

In the drawings, Fig. 1 is a vertical sectional view through a pump embodying the invention, taken on the line 1--1 of Fig. 2;

Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1.

Referring to the drawings, the pump includes a. frame or casing formed by the end sections 3 and an annular central section 4, these sections being secured together by clamping bolts 5, each end section having apertured bearing bosses 6.

A tting 7 has a base' portion 8 closing olf the outer end of one of the bosses 6 of one end section 3 to which it is secured, said fitting having a centrally disposed bore 9 communicating witha passage 10 to which the inlet and supply pipe 1l. for the hydraulic fluid is connected.

A fitting 12 similar to the fitting 7, has a base 14 closing olf the outer end of the boss 6 of the other section 3 to which it is secured, this fitting having a centrally disposed bore 15 communicating with a passage 16 to which the outlet or pressure pipe 17 leads from the pump. l

A valve shaft 18 has one end mounted in the bore 9 in a fluid tight mannerand the other end similarly mounted in the bore 15, said shaft being held againstpossible rotation by a'key 19 seated inthe fitting v12 and engaging in a keyway 20 in the shaft 18. Thus the shaft 18 is centrally mounted relative to the sections 3 and 4 of the supporting frame or casing.

The shaft 18 has the tubular shaft portions 23 and 24 and an enlarged cylindrical portion 25 providing shoulders 26 and 27, the shaft portion 23 providing an inlet conduit 28] communicating with a passage 29 in the portion 25 while the shaft portion 24 provides an outlet conduitl 30 communicating with a passage 3l ln the portion 25. The passage 29 communicates with a portor recess 32 formed on, the outer part of the portion and forming an inlet port while the passage 31 communicates with a port or recess 33 also i formed on the outer part of said portion 25 at .the opposite side thereof from the recess 31 and forming an outlet port. Theports 32 and 33 are separated from each other by the parts 34 of the portion 25. Beyond these ports at one side the 95 portion 25 of said shaft has a plurality of radially disposed passages 35 leading from the pressure or outlet conduit 30 to an anular groove 36 on the outer surface of said portion.

The rotor includes the main annular or ring shaped body portion 37 and end plates 38 and 39. The end plate 38 is in the form of a disk mounted on a hub extension 40 of the rotor which extension is mounted to turn on the part 24 of the shaft 18 and journalled in a ball bearing journal 4l. whose outer race 42 ts snugly in the boss 6 of one of the frame sections 3, the inner race 43 of said bearing being clamped against the end plate 38 as at 44 by a nut 45 in threaded engagement with the threaded end of hub and held in adjusted position by a lock washer 46, said plate 38 abutting the side of the body portion 37 adjacent said hub extension 40.

The end plate 39 has a tubular hub portion 47 mounted to turn on the part 23 of the shaft 18 and journalled in a ball bearing journal 48 whose outer race 49 fits snugly in the boss 6 of theother frame section 3,- the inner race 50 of said bearing being clamped by a nut 52 and lock Washer 53 against al gear 54 keyed to the hub and engaging a shoulder 55 thereon.

The end plates 38 and 39 are clamped together f and to the rotor body 37 by clamping bolts 56 which pass through these parts.

'me width of the rotor body 37 is such that 95 the end plate 39 and the hub portion of the rotor body have either a nice running fit with the shoulders 27 and 26 .or preferably a thrust washer or collar 57 vof suitable metal abuts against lo the shoulder 26 at one side and the endplate 39 on the other side to take any Wear due to the thrust of the shaft 18 against this side of the rotor structure, said washer having oil retaining grooves 57 on its sides. IThe inner bore 58 of the' 105 body portion 37 has a nice running fit on the cylindrical portion 25 of said shaft. This arrangement of the rotor relative to the shaft 18 effectively prevents the escape of pressure fluid along the parts 23 and 24 of the shaft 18 and it 110 also provides a rotor assembly in which the parts will be iirmly held together in proper relation.

The rotor body 37 is provided with a series of vane-guiding and carrying slots 59 and a vane or blade 69 is slidably mounted in each of these slots with a nice working fit and has an outer edge 61 engaging the inner surface of the cylinder barrel or ring 62, saidv blades dividing the space between the rotor and ring 62 into v a plurality oi pumping compartments P and at the base of each slot a passage 63 leads to the annular groove 36 .in the shaft 18 which as has been noted forms a part of the discharge line and thus duid under pressure is delivered against the backs of the blades at all times and serves to constantly urge them outwardly against the ring 62. These blades are substantially radially disposed or slightly offset irom a radial line so that as the rotor revolves the barrel or ring 62 will also rotate. The widths of the ring 62 and the blades are such as to provide a working fit with the end plates 38 and 39. Radially disposed 'passages 64 are formed' in the rotor body 37 between adjacent blades and serve to connect each. of the pumping compartments with the ports 32 and 33 respectively as the rotor is turned through suitable drive means, not shown, connected with the gear 54:.

The cylindrical member or ring 62 forming the barrel of the pump casing has an annular groove 65 formed therein and forms the inner race of a roller bearing including radially spaced rollers 66, the spacing rings 67 and the outer race ring 68 which is mounted in a shiftable support 69 of generally cylindrical shape having diametrically disposed fiat faces 70 slidably movable upon the guide bosses 71 formed on the central section 4.

It will be observed that shifting of the support 69 for the ring 62 will cause said ring to be shifted oi center relative to the rotor andQ upon the extent of eccentricity thus produced will de pend the volume oi pressure iiuid delivered by the pump and hence its pumping capacity. Any

suitable means may be used to shift the support- 69 and in the present instance I have shown a manually operated mechanism in Fig. 1 for this purpose comprising a shaft or rod 72 having a headed end 73 secured by a sleeve nut 74 in a recess 75 in said support and adapted to turn therein, said rod working through an opening 76 in the casing section 4 and clamped to a rotatable handle 77 which has a threaded inner end 78 working in a threaded bore.79 formed in a boss on the casing section 4. For clamping the rod 72 to the handle, the threaded outer end of said rod extends through a. centrally disposed bore in the inner end of said handle and is clamped to the handle by the shoulder 80 and the nut 81.

With the above construction and assuming anti-clockwise rotation of the rotor as viewed in Fig. 1, While the vanes60 oi the rotor on the side adjacent the port 32 are passing through about half oi their revolution the compartments between these blades are gradually enlarged and suction takes place, the iiuid coming from the pipe 11 and passing through passages 10, 28, 29,

port 32 and passages 64 into these compartpressure discharge pipe 17 at the desired working pressure, it beingnoted that some of this pressure iiuid proceeds from the passage 30 through passages 35 and 63 into the slots 59 to constantly act on the backs of the blades 60 to hold them against the ring 62. It is also to be noted that the varies 60 do not revolve relative to 'the ring 62 but said ring is free to revolve with the blades and. with the end plates 38 and 39, the roller.- bearings offering no appreciable resistance to its turning and the pressure of the blades against the ring being such as to carry the ring with them. Owing to the fact that the support 69 for the ring is during pumping eccentrically disposed relative to the axis of the rotor, the blades 60 move in and out and co-operate with the barrel to accomplish the pumping action, as described'above. Since the travel of the blades in and out relative to rotor is dependent upon the eccentricity of the ring 62 relative to the rotor,

it will be noted that decreasing this eccentricity reduces the volume of liquid handled by the pumping compartments and iinally at zero eccentricity or when the center of revolution of the ring 62 coincides with the axis of the valve shaft 18, no reciprocating movement of the blades takes place and no liquid will be pumped. Furthermore, it will be noted that in this device the rotor and part 25 of the shaft 18 are so associated as to prevent leakage from the pumping compartments along said shaft 18 and that consequently the pump will efiiciently handle the Working iiuid at relatively high pressures.

It is also to be noted from Fig. 1 that the valve structure is such that only one of the passages 64 can be sealed oi by the part 3e between suction and discharge at any one time during the cycle of operation of the pump and this is important for the efiicient operation of the pump as it prevents the locking ofi of a plurality of pumping compartments on the pressureportion of the cycle.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is:

l. In a pump of the character described, the combination with a supporting frame,l a stationary shaft supported by said frame having a cylindrical valve portion provided with inlet and outlet ports and end portions of smaller diameter than said valve portion provided with inlet and outlet passages respectively communicating with said inlet and outlet ports, a rotor having an annular body portion mounted to rotate about said valve portion and end plates secured to said body portion, the body portion of said rotor and one of said end plates having hub portions abutting said valve portion and mounted to lturn on the end portions of said shaft, journals in said frame for said hub portions, a shiftable ring member revolving with the rotor and defining therewith a chamber, said ring memr-:r being slidable between said end plates, reciprocating blades mounted in the body of the rotor and working between said end plates and deiining with said rotor and ring member a .plurality of pumping compartments, said rotor having passages to establish communication between said pumping compartments and said ports in said shaft as the rotor revolves, and adjustable means in which said ring member is freely journalled for shifting said ring member relative to the axis of rotation 0S the rotor to vary the output of the pump.

iis

2. In a pump otthe characterl described. the combination with a supporting frame, a stationi vary shaft supported by said frame having a cyand thrust ring and mounted to turn on the end portions of said shaft, a shiftable ring .member revolving with the rotor and-deiining therewith a chamber, said ring member being slidable hetween said end plates, reciprocating blades mounted in the body of the rotor and working between said end plates and defining with said rotor and ring member a plurality of pumping compartments, said rotor having passages to establish communication between said 'pumpingl compartments and said ports in said shaft as the rotor revolves, and adjustable means in which said ring member is freely journalled iorl shifting said ring member relative to the axis of rotation of the rotor to vary the output of the pump.

PERCY OLIVER OTI'. 

